<!DOCTYPE html>
<html>

	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>

	<body>

		<p>点击下面的按钮，将代码块循环五次：</p>
		<button onclick="myFunction()">点击这里</button>
		<p id="demo"></p>

		<script>
			function myFunction() {
				var x = "";
				for(var i = 0; i < 9; i++) {
					x = x + "The number is " + i + "<br>";
				}
				document.getElementById("demo").innerHTML = x;
			}
		</script>

	</body>

</html>